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WM7211E Dataheets PDF



Part Number WM7211E
Manufacturers Cirrus Logic
Logo Cirrus Logic
Description Top Port Digital Silicon Microphone
Datasheet WM7211E DatasheetWM7211E Datasheet (PDF)

WM7211E Top Port Digital Silicon Microphone DESCRIPTION The WM7211 is a low-profile silicon digital microphone. It offers high Signal-to-Noise Ratio (SNR) and low power consumption and is suited to a wide variety of consumer applications. The WM7211 incorporates Cirrus’s proprietary CMOS/MEMS membrane technology, offering high reliability and high performance in a miniature, low-profile package. The WM7211 is designed to withstand the high temperatures associated with automated flow solder ass.

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WM7211E Top Port Digital Silicon Microphone DESCRIPTION The WM7211 is a low-profile silicon digital microphone. It offers high Signal-to-Noise Ratio (SNR) and low power consumption and is suited to a wide variety of consumer applications. The WM7211 incorporates Cirrus’s proprietary CMOS/MEMS membrane technology, offering high reliability and high performance in a miniature, low-profile package. The WM7211 is designed to withstand the high temperatures associated with automated flow solder assembly processes. (Note that conventional microphones can be damaged by this process.) The WM7211 incorporates a high performance ADC, which outputs a single-bit data stream using Pulse Density Modulation (PDM) encoding. The WM7211 supports selectable left/right channel assignment for a two-channel digital microphone interface, enabling efficient connection of multiple microphones in stereo/array configurations. The WM7211 offers tight tolerance on the microphone sensitivity, giving reduced variation between parts. This removes the need for in-line production calibration of partto-part microphone variations. FEATURES  High SNR (61dB)  Low variation in sensitivity (±1dB tolerance)  Low current consumption - 2μA (Sleep) - 735μA (Normal operation)  PDM digital audio output  Stereo/array operation  Proprietary ADC technology - Reduced clock jitter sensitivity - Low noise floor - Stable in overload condition  Top Port LGA Package  1.64V to 3.7V supply APPLICATIONS  Mobile telephone handsets  Portable computers  Portable media players  Digital still cameras  Digital video cameras  Bluetooth headsets  Portable navigation devices BLOCK DIAGRAM WM7211 VDD CHARGE PUMP CONTROL 3D VIEW CLK DAT LRSEL CMOS MEMS Transducer AMP ADC GND 4.00mm x 3.00mm x 1.00mm LGA package http://www.cirrus.com Copyright  Cirrus Logic, Inc., 2011–2016 (All Rights Reserved) Rev 4.0 MAR ‘16 TABLE OF CONTENTS WM7211E DESCRIPTION................................................................................................................ 1 FEATURES ..................................................................................................................... 1 APPLICATIONS.............................................................................................................. 1 BLOCK DIAGRAM ......................................................................................................... 1 3D VIEW ......................................................................................................................... 1 TABLE OF CONTENTS.................................................................................................. 2 PIN CONFIGURATION ................................................................................................... 3 PIN DESCRIPTION......................................................................................................... 3 ORDERING INFORMATION........................................................................................... 3 ABSOLUTE MAXIMUM RATINGS ................................................................................. 4 IMPORTANT ASSEMBLY GUIDELINES ....................................................................... 4 RECOMMENDED OPERATING CONDITIONS.............................................................. 4 ACOUSTIC AND ELECTRICAL CHARACTERISTICS .................................................. 5 TERMINOLOGY .........................................................................................................................6 AUDIO INTERFACE TIMING .....................................................................................................7 TYPICAL PERFORMANCE ............................................................................................ 8 APPLICATIONS INFORMATION ................................................................................... 9 RECOMMENDED EXTERNAL COMPONENTS ........................................................................9 OPTIMISED SYSTEM RF DESIGN ...........................................................................................9 CONNECTION TO A CIRRUS AUDIO CODEC .........................................................................9 PCB LAND PATTERN AND PASTE STENCIL ........................................................................10 PACKAGE DIMENSIONS............................................................................................. 11 IMPORTANT NOTICE .................................................................................................. 12 REVISION HISTORY .................................................................................................... 13 2 Rev 4.0 PIN CONFIGURATION WM7211E 32 41 5 Top View PIN DESCRIPTION PIN NAME 1 VDD 2 LRSEL TYPE Supply Digital Input 3 CLK Digital Input 4 DAT Digital Output 5 GND Supply DESCRIPTION Power Supply Channel Select 0 = Data output following falling CLK .


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